Critical Marangoni Number for Disappearance of Striations during Spin-Coating
Suguru Shiratori, Koji Tanikawa, Toma Kamon, Mizuho Ueda, Takashi Kuroiwa, Hideaki Nagano, Kenjiro Shimano
TL;DR
This study identifies a critical Marangoni number range (90–160) that determines when striations disappear during spin-coating processes.
Contribution
The paper introduces a novel method to determine the critical Marangoni number for striation disappearance using numerical simulation and experimental observation.
Findings
Striations decreased by 3 orders of magnitude when using an epoxy resin and diglyme solvent mixture.
The critical Marangoni number range for striation disappearance was determined as Ma_c = 90–160.
The decay of striations correlates with the Marangoni number falling below a subcritical threshold.
Abstract
This study investigated the striations, which arise as spoke-like thickness undulations during the spin-coating process. It was found that the striations, which once appeared, then disappeared when a mixture of epoxy resin and diglyme solvent was used as the coating fluid. The time-dependent wavelength spectrum was obtained by applying short-time Fourier analysis to the optically measured spatiotemporal thickness variation. The wavelength components corresponding to the striations decreased by 3 orders of magnitude before and after the decay. Under the hypothesis that striations are generated by the type of solutal Marangoni-Bénard instability, the disappearance of the striations can be regarded as the result of the Marangoni number falling below the subcritical value for the occurrence of striations. To determine the critical Marangoni number for the disappearance of the instability,…
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Taxonomy
TopicsFluid Dynamics and Thin Films · Nanofabrication and Lithography Techniques · Nanomaterials and Printing Technologies